$3000-$5000+ depending on your vehicle type.

Procharger is a supercharger. It is a brand of centrifugal superchargers.

You can purchase a centrifugal supercharger online from websites such as Jegs and Superchargers Online. You may also be able to locate one on the auction website eBay.

Depends on the type of supercharger. Roots or centrifugal.

A roots sits on top of the motor and either bolts on to the intake manifold, or the supercharger has the intake as part of the unit. Unless the roots supercharger is from another 4.6L modular than the answer is probably no. Unless you're a good machinist.

If its a centrifugal type supercharger, which looks more like a turbo off to the side of the motor. Then you can probably buy an installation kit for your car from the manufacturer of the supercharger.

The superchargers from a single model line are all the same. Its just how its mounted to the individual car that varies. Either way if you search around you may be able to find a mounting kit for your application.

I think you mean "centrifugal" supercharger. It depends, a positive displacement will give you more low end torque where a centrifugal builds boost as your RPMs increase, giving you more top end power and max speed, but won't do much at low RPMs. That said, centrifugal are a bit more efficient and probably cheaper.